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Chill hours in T4P

The short answer

T4P averages 1,131 chill hours per winter (7901,364 across 10 years) in USDA zone 3b.
T4P climate
Average chill hours1,131 (790–1,364 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically April 29 – May 22
First fall frosttypically September 28 – October 14

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against T4P’s chill hours and zone:

How many chill hours does T4P get?
T4P averages 1131 chill hours per winter, ranging from 790 to 1364 across the last 10 years.
What hardiness zone is T4P?
T4P is in USDA hardiness zone 3b.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026